Robot vacuum cleaner



FIG. 1 is a front elevation view of a first embodiment of a robot vacuum cleaner, showing the new design;

FIG. 2 is a back elevation view thereof.

FIG. 3 is a left elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front perspective view thereof;

FIG. 8 is a rear perspective view thereof;

FIG. 9 is a front elevation view of a second embodiment of the robot vacuum cleaner, showing the new design;

FIG. 10 is a back elevation view thereof;

FIG. 11 is a left elevation view thereof;

FIG. 12 is a right elevation view thereof;

FIG. 13 is a top plan view thereof;

FIG. 14 is a bottom plan view thereof;

FIG. 15 is a front perspective view thereof;

FIG. 16 is a rear perspective view thereof;

FIG. 17 is a front elevation view of a third embodiment of the robot vacuum cleaner, showing the new design;

FIG. 18 is a back elevation view thereof.

FIG. 19 is a left elevation view thereof;

FIG. 20 is a right elevation view thereof;

FIG. 21 is a top plan view thereof;

FIG. 22 is a bottom plan view thereof;

FIG. 23 is a front perspective view thereof; and,

FIG. 24 is a rear perspective view thereof.

The broken lines show portions of the robot vacuum cleaner that form no part of the claimed design. 

CLAIM The ornamental design for a robot vacuum cleaner, as shown and described. 